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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1621563	Summit Materials Inc.	SUM	Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)	471984212

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1636106	Charles Douglas Rauh	C/O Summit Materials, Inc. 1550 Wynkoop Street, 3Rd Floor Denver CO 80202	See Remarks	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Acquisiton	2017-08-04	31,500	$18.00	38,813	No	4	M	Direct
Class A Common Stock	Disposition	2017-08-04	31,500	$29.32	7,313	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Options (right to buy)	Disposition	2017-08-04	31,500	$0.00	31,500	$18.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
135,583		2025-03-11	No	4	M	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $29.16 to $29.47, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
Reflects the grant of 167,083 options that vest in four equal annual installments beginning on March 11, 2016.